I thought both 1 series and 2 series were more comparable to A3.. both about the same size.
A1 is like TINY. It makes Mini Cooper look small. So I don't know how 1 series 3/5 doors are going to be more comparable to A1 than A3.

2 series is competitor to A3 but 1 series is competitor to A1?
1 series and 2 series are supposed to be about the same size, only difference being the style. In comparison, A3 is the similar size as current 1 series but A1 is like MINI Cooper tiny.

But aside from wording of who is who's competitor, I like the plan. Looks like 1 series is going to have many different versions